$ git clone -n https://src.fedoraproject.org/rpms/rust-bytes.git /var/lib/mock/f40-build-2129692-50787/root/chroot_tmpdir/scmroot/rust-bytes
Cloning into '/var/lib/mock/f40-build-2129692-50787/root/chroot_tmpdir/scmroot/rust-bytes'...
$ git fetch origin 8da6ff093321348669003d237486fff7942858c1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bytes
 * [new ref]         8da6ff093321348669003d237486fff7942858c1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8da6ff0 Update to version 1.5.0; Fixes RHBZ#2237845